AC 20-129

Historical

Advisory circular · Airworthiness Approval of Vertical Navigation (VNAV) Systems for use in the U.S. National Airspace System (NAS) and Alaska

Approved
September 12, 1988
Last reviewed
February 25, 2011
Cancelled by
AC20-138B
Family
AC 20-129 · 1 version
14 CFR parts
23, 25, 43, 91

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed November 21, 2025.

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b. Operational Procedures. Operators and their flightcrews should consult the approved flight manual supplement for their aircraft to determine approved operational procedures that may apply to particular systems installed in various aircraft. flightcrews must be aware that these procedures may vary for different equipment and in different aircraft, and the appropriate procedures for a particular system installation can only be determined by reference to the approved flight manual or other FAA approved documents.

Phone I: M rings Thomas E. McSweeny Acting Deputy Director, Aircraft Certification Service Par. 10 13